What type of spark plugs are you running ?

Depends on the engine. My racey stuff, NGK V groove race plugs..I find them easier for me to read, they seem to be a little snappier with them too. For a street engine with multi-spark or high power ignitions, I run Autolites. Champions are used for every day stock type stuff. I never can get the milage from Champions when a strong ignition is used. The Autolites dotn cost much, and dont seem to erode as fast for me.